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Related Experiment Video

Updated: Mar 19, 2026

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Cell structure imaging with bright and homogeneous nanometric light source.

Masahiro Fukuta1, Atsushi Ono2,3, Yasunori Nawa2

  • 1Graduate School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka, Hamamatsu, 432-8561, Japan.

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|June 9, 2016
PubMed
Summary

A novel nanoscale light source using zinc oxide (ZnO) thin films enables label-free optical nano-imaging of cells. This bright, homogeneous light source achieves high spatial resolution and signal-to-noise ratio for cellular structure visualization.

Keywords:
bio-imagingcathodoluminescencesuper-resolution microscope

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Area of Science:

  • Biophysics
  • Materials Science
  • Cell Biology

Background:

  • Label-free imaging techniques are crucial for studying live biological systems.
  • Existing nano-imaging methods often face limitations in resolution, signal-to-noise ratio, or require specific labeling.

Purpose of the Study:

  • To develop a bright and homogeneous nanometric light source for label-free optical nano-imaging.
  • To demonstrate the visualization of cellular structures below the diffraction limit with high resolution.

Main Methods:

  • Fabrication of a zinc oxide (ZnO) luminescent thin film using atomic layer deposition (ALD).
  • Excitation of the ZnO film with a focused electron beam to generate a nanoscale light source.
  • Utilizing the developed light source in an electron beam excitation-assisted microscope for imaging.

Main Results:

  • The ALD-fabricated ZnO film produced a bright, homogeneous nanoscale light emission.
  • Label-free imaging of dendritic structures and intracellular granules in CHO cells was achieved.
  • A spatial resolution of 120 nm and a signal-to-noise ratio (SNR) greater than 10 were obtained.

Conclusions:

  • Atomic layer deposition (ALD) is effective for creating high-quality ZnO films for nanoscale light sources.
  • The developed nano-imaging system offers high spatial resolution and high SNR for label-free cellular visualization.
  • This technique advances optical nano-imaging capabilities for biological applications.